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61.
Gehring Christoph Zelarayán Marcelo Correa Luz Ronildson Lima Almeida Rosângela Borges Boddey Robert Michael Leite Márcio Fernandes Alves 《Plant and Soil》2020,454(1-2):447-460
Plant and Soil - Aggressive ruderal plant species pose an increasing problem in anthropically degraded lands. They both affect and are affected by other vegetation and by soil fertility in their... 相似文献
62.
Laura Remacha David Pirman Christopher E. Mahoney Javier Coloma Bruna Calsina Maria Currás-Freixes Rocío Letón Rafael Torres-Pérez Susan Richter Guillermo Pita Belén Herráez Giovanni Cianchetta Emiliano Honrado Lorena Maestre Miguel Urioste Javier Aller Óscar García-Uriarte María Ángeles Gálvez Alberto Cascón 《American journal of human genetics》2019,104(5):1008-1010
63.
Elio R.D. Castillo Dardo A. Martí Maximiliano M. Maronna María C. Scattolini Diogo C. Cabral‐de‐Mello María M. Cigliano 《Systematic Entomology》2019,44(1):61-74
In an attempt to unveil the origin of neo‐sex chromosomes in Ronderosia Cigliano grasshoppers, we performed a combined phylogenetic analysis based on morphological (external morphology and male genitalia) and molecular data (COI, COII, 16S and ITS2) to explore the chromosome evolution within the genus. We also analysed the distributional patterns of the various Ronderosia species and considered the possible role of chromosome rearrangements (CRs) in speciation processes within the genus in the light of ‘suppressed‐recombination’ models. We mapped the states of three chromosomal characters on the combined tree topology. The combined evidence supported Ronderosia as a monophyletic group. The cytogenetic analyses of the genus demonstrated the importance of rearranged karyotypes with single, complex and multiples neo‐sex chromosome determination systems in all species. The chromosome character optimisation suggests X‐autosome centric fusion as the mechanism responsible for neo‐sex chromosome formation in most Ronderosia species, except in R. dubia and R. bergii. Similar autosomes were involved in fusions with the ancestral X chromosome in Ronderosia, supporting previous hypotheses on the unique origin of X‐autosome fusion for the sex chromosome in the genus. As a source of chromosome variation, autosome‐autosome centric fusion played a secondary role in Ronderosia compared with other Dichroplini. Given the homogeneity in the morphological features, the sympatric distribution of closely related species and the intrinsic property of centric fusion as suppressors of the crossing over, we suggest that CRs may have played a key role during the speciation process within Ronderosia. 相似文献
64.
J. Paulo Macedo Jorge Pereira João Faria J. Luis Alves José López-López 《Computer methods in biomechanics and biomedical engineering》2013,16(12):655-662
AbstractObjectives: The purpose of the present study was to evaluate the distribution and magnitude of stresses through the bone tissue surrounding Morse taper dental implants at different positioning relative to the bone crest. Materials and Methods: A mandibular bone model was obtained from a computed tomography scan. A three-dimensional (3D) model of Morse taper implant-abutment systems placed at the bone crest (equicrestal) and 2?mm bellow the bone crest (subcrestal) were assessed by finite element analysis (FEA). FEA was carried out on axial and oblique (45°) loading at 150 N relatively to the central axis of the implant. The von Mises stresses were analysed considering magnitude and volume of affected peri-implant bone. Results: On vertical loading, maximum von Mises stresses were recorded at 6-7?MPa for trabecular bone while values ranging from 73 up to 118?MPa were recorded for cortical bone. On oblique loading at the equiquestral or subcrestal positioning, the maximum von Mises stresses ranged from 15 to 21?MPa for trabecular bone while values at 150?MPa were recorded for the cortical bone. On vertical loading, >99.9vol.% cortical bone volume was subjected to a maximum of 2?MPa while von Mises stress values at 15?MPa were recorded for trabecular bone. On oblique loading, >99.9vol.% trabecular bone volume was subjected to maximum stress values at 5?MPa, while von Mises stress values at 35?MPa were recorded for >99.4vol.% cortical bone. Conclusions: Bone volume-based stress analysis revealed that most of the bone volume (>99% by vol) was subjected to significantly lower stress values around Morse taper implants placed at equicrestal or subcrestal positioning. Such analysis is commentary to the ordinary biomechanical assessment of dental implants concerning the stress distribution through peri-implant sites. 相似文献
65.
66.
Timmers LF Ducati RG Sánchez-Quitian ZA Basso LA Santos DS de Azevedo WF 《Journal of molecular modeling》2012,18(2):467-479
Cytidine Deaminase (CD) is an evolutionarily conserved enzyme that participates in the pyrimidine salvage pathway recycling cytidine and deoxycytidine into uridine and deoxyuridine, respectively. Here, our goal is to apply computational techniques in the pursuit of potential inhibitors of Mycobacterium tuberculosis CD (MtCDA) enzyme activity. Molecular docking simulation was applied to find the possible hit compounds. Molecular dynamics simulations were also carried out to investigate the physically relevant motions involved in the protein-ligand recognition process, aiming at providing estimates for free energy of binding. The proposed approach was capable of identifying a potential inhibitor, which was experimentally confirmed by IC50 evaluation. Our findings open up the possibility to extend this protocol to different databases in order to find new potential inhibitors for promising targets based on a rational drug design process. 相似文献
67.
68.
Sousa AF Andrade PZ Pirzgalska RM Galhoz TM Azevedo AM da Silva CL Aires-Barros MR Cabral JM 《Biotechnology letters》2011,33(12):2373-2377
A novel cell separation process based on immunoaffinity aqueous two phase systems is presented to isolate and purify CD34+ stem/progenitor cells directly from the whole umbilical cord blood (UCB). A system, composed of polyethylene glycol and dextran,
was evaluated for the selective recovery of CD34+ cells from UCB. A monoclonal antibody against the CD34 surface antigen was used for the direct partitioning of CD34+ cells in UCB to the PEG-rich phase. The initial population of CD34+ cells (0.2% of the initial sample) was enriched to values up to 42% in a single partitioning step, while the majority of
contaminant cells were partitioned to the dextran-rich phase (1.37 × 10−2 < KP < 2.76 × 10−2). This novel selection method allowed a recovery yield of 95% of CD34+ cells with a purification factor of 245 and is expected to pave a new way to purify hematopoietic stem/progenitor cells for
use in a variety of clinical settings. 相似文献
69.
The acyl coenzyme A (CoA) binding protein AcbA is cleaved to form a peptide (SDF-2) that coordinates spore encapsulation during the morphogenesis of Dictyostelium discoideum fruiting bodies. We present genetic evidence that the misspecification of cell types seen in mutants of the serine protease/ABC transporter TagA results from the loss of normal interactions with AcbA. Developmental phenotypes resulting from aberrant expression of the TagA protease domain, such as the formation of supernumerary tips on aggregates and the production of excess prestalk cells, are suppressed by null mutations in the acbA gene. Phenotypes resulting from the deletion of tagA, such as overexpression of the prestalk gene ecmB and the misexpression of the prespore gene cotB in stalk cells, are also observed in acbA mutants. Moreover, tagA- mutants fail to produce SDF-2 during fruiting body morphogenesis but are able to do so if they are stimulated with exogenous SDF-2. These results indicate that the developmental program depends on TagA and AcbA working in concert with each other during cell type differentiation and suggest that TagA is required for normal SDF-2 signaling during spore encapsulation. 相似文献
70.
The trophic structure of benthic communities in the Tagus estuary and adjacent coastal shelf was characterized according to
a functional guild approach, based on sampling surveys conducted between 1987 and 2000. Macrobenthic organisms were assigned
to seven distinct trophic groups (herbivorous, filter feeders, surface deposit feeders, subsurface deposit feeders, carnivores,
filter feeders/detritivores, carnivores/detritivores) and the dominance of these groups was related to environmental variables
using multivariate ordination techniques. Surface-deposit feeders were numerically dominant in the Tagus estuary, making up
52% of the benthic communities, while in the adjacent coastal shelf the assemblage was dominated by both surface-deposit feeders
and filter feeders (37% and 33%, respectively). When biomass was considered, filter feeders and filter feeders/detritivores
were the dominant groups in the estuary, while for the adjacent coastal shelf filter feeders represented 83% of the total
biomass. Salinity, depth and sediment composition were the main factors structuring spatial distribution. Surface-deposit
feeders were the most abundant macrobenthos of the upper estuary. Surface deposit feeders also dominated the middle and the
lower estuary but the proportion of filter feeders as well as other trophic groups increased with salinity. Generally, a more
even distribution of trophic structure was found at stations with high salinity. In the adjacent coastal shelf, the trophic
diversity decreased with depth. The trophic structure revealed that filter feeders dominated in abundance and biomass in shallow
sandy sediments (<25 m), while in deeper sandy mud and muddy habitats (>50 m to 260 m), deposit feeders and carnivores were
the most important groups in abundance and biomass, respectively. 相似文献